Vietts l



(No Model.)

v. L. RICE. PULVERI'ZING MILL.

IIVVE/V TOR w bU/JTTORNEYJ NITED STATES PATENT OFFICE.

VIETTS L. RICE, OF NEW YORK, N. Y.

PU LVERIZAI SPECIFICATION forming part of Letters Application filed March 19, 1890.

To all whom. it may concern.-

Be it known that I, VIETTs L. RICE, of New York, in the county and State of New York, have invented a certain new and useful Im-. provement in Pulverizing-Mills, of which the following is a specification.

I will describe a mill embodying my iniprovement, and then point out the novel features in the claims.

In the accompanying drawings, Figure 1 is a vertical section of a mill embodying my improvement. Fig. 2 is a horizontal section taken at the plane of the dotted line m as, Fig. 1. Fig. 3 is a horizontal section on the line 00 00, Fig. 1, looking upward.

Similar letters of reference designate corresponding parts in all the figures.

A designates a chamber, here shown as made in the form of a pan. It may be made of any suitable materialas, for instance, of iron. In it is a ring B, which, as here shown, is set into the recess formed in the inner side of the chamber A. This ring forms one of the grinding or pulverizing surfaces, and it may be made of any desirable materialas, for instance, of steel.

O designates a number of rolls arranged to travel around the interior of the ring B. As this ring is in eifect a part of the chamber, the rolls maybe regarded as traveling around the inner surface of the chamber. There are in the present instance three of these rolls C, and they are affixed to upright shafts D, which are journaled so as to be free to rotate within journal-boxes E, that are arranged in a head F. Thehead F is of small diameter as compared with the diameter of the chamber A, so that the rolls have to swing outwardly into positions which cause their shafts D to diverge from each other in order to contact with the ring B. The journal-boxesE are provided with trunnions or journals 6, which fit in recesses or bearings in, the head 1 in such manner as to allow of ti? winging of the rolls 0 and shafts D outward. The head F is secured to a main shaft Gr,which is supported in a frame II; This frame II may be made of any suitable material, and consists of a head 71. and a number of converging standards h, which are fastened at theupper end to the head and atthe lower end rest NG-MILL.

Patent No. 430,884, dated June 24, 1890.

Serial No. 344,4:90. (No model.)

a central hub 7F, and in this is fitted a vertically-adjustable bearing-sleeve I. Internally this sleeve tapers downwardly and within it receives a downwardly-tapering portion of the main shaft G. The main shaft is supported vertically by having atlixed to its upperend a driving-pulley1', which has a downwardly-extended portion fitting upon the top of the hub 71 on the head h of the frame II.

The head F is secured to the lower end of the main shaft G. Hence when the main shaft is rotated the shafts D and rolls C will be revolved around the axis of the main shaft. Centrifugal force generated by this revolution of the rolls and their shafts will cause the rolls to swing outwardly into contact in a surface of the ring B. The friction which will be generated at the surface of the rolls in their rotation will cause thein to 1'0- tate on their own axes as they are revolved around the chamber. When the rolls are at rest, they will fall away from the wall of the chamber, allowing material to be placed be tween them and the wall. As soon as looseness occurs through wear between the main shaft Gand sleeve I the sleeve may be moved upward to compensate for this wear. I have shown a lever J fulerumed between its ends in the hub of the head h of the frame 11 and having a toothed inner end engaging with circum ferential grooves and ribs in the sleeve, and this serves as a convenient means for adjusting the sleeve and retaining it in position. Should there be wear on one side of the sleeve more than another, it may be removed, partially rotated, and reinserted, and to enable it to remain in any position into which it may be adjusted I provide it and the hub wit-h a tongue-and-grooved connection. As here shown, equidistantly-arranged tongues 71 extend from the exterior of the sleeve I into grooves formed in the interior of the hub. The inner surface of the ring B is shown as vertically disposed, and when it is so disposed the rolls will taper downwardly,

so that the operating portions of their sur upon any suitable support. The head It has ward taper. It may be made of any suitable too perforated or reticulated material. Its upper edge may be supported from the standards h. Preferably an annular plate L will be used above it, and when used will be supported by the standards and connected to the upper edge of the shell, so as to extend inwardly above the latter.

M designates a shell extending around the chamber A and having a section which extends around the screen K. The space between the screen and upper section of the shell M communicates with the space between the exterior of the chamber and the lower section of the shell M, and the latter at the lower end is open to a hopper N, which is arranged below the chamber and shell. It is intended that material when pulverized to the proper degree of fineness shall escape through the screen and be discharged into the hopper. I have shown one of the shafts D as provided with a spiral flange cl. As this shaft rotates, the spiral flange will lift up the pulverized material and cause it to be distributed well over the surface of the screen as it flies outward against the latter.

N is a conveyor for removing the pulverized material from the hopper N, and N is a chute through which material is fed to the apparatus.

WVhat I claim as my invention, and desire to secure by Letters Patent, is

1. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a main shaft, a number of rolls, shafts upon which these rolls are mounted, a head connected to the main shaft, and oscillating journal-bearings having such relation to the main shaft that when the rolls are at rest said rolls will fall away from the wall of the chamber, substantially as specified.

2. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a number of rolls arranged to travel around the interior of the same, shafts connected with the rolls, and a main shaft serving to revolve the roll-shafts, but connected loosely therewith, so as to allow the rollshafts to rotate on their own axes independently, one of said roll-shafts having a spiral flange, substantially as specified.

3. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, three rolls arranged to travel around the interior of the same, three shafts connected with the rolls and arranged to be equidistant at their upper ends, a main shaft serving to revolve the roll-shafts, but connected loosely therewith, so as to allow the roll-shafts to rotate on their own axes independently, and a longitudinally adjustable bearing for the main shaft, substantially as specified.

4. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a downwardly-tapering roll arranged to travel around the interior of the same and having the outer portion of its surface substantially parallel with the vertical wall of the chamber, a shaft connected with the roll, a head in which said shaft is journaled so as to be capable of rotation therein, and a main shaft connected to said head and serving to revolve the roll, substantially as specified.

5. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a roll arranged to travel around the interior of the same, a shaft connected with the roll, a main shaft, an adjustable bearingsleeve for the main shaft, having means, substantially as specified, for retaining it as adjusted, a head secured to the main shaft, and a journal-box receiving the roll-shat t and having an oscillating connection with the said head, substantially as specified.

6. In a pulverizing-mil], the combination of a chamber for receiving material to be pulverized, a roll arranged to travel around the interior of the same, a shaft connected with the roll and provided with a spiral flange, and a main shaft revolving the rollshaft, substantially as specified.

7. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a roll arranged to travel around the interior of the same, a shaft connected with the roll, a main shaft having a downwardlytapering portion, aframe orstandard through which said main shaft passes, a pulley attached to the upper end of the said main shaft and having a bearing upon the said frame or standard for the purpose of sustaining the main shaft vertically, a sleeve having an upwardly flaring interior surface fitting the downwardly tapering portion of the main shaft and an exterior fitting a cavity or opening in the said frame or standard, and a lever engaging with the sleeve for adjusting it longitudinally, substantially as specified.

s. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a roll arranged to travel around the interior of the same, a shaft connected with the roll, a main shafthaving a downwardlytapering portion, a frame or standard through which said main shaft passes, a pulley attached to the upper end of said main shaft and having a bearing upon the said frame or standard for the purpose of sustaining the main shaft vertically, and a sleeve tapering internally to fit the tapering portion of the main shaft and having a tongue-and-grooved connection with a cavity in the said frame or I the space which is between the chamber and the said shell, and a spiral flange carried by the roll to carry material to the screen, substantially as specified.

10. In a pulverizing-mill, the combination of a chamber for receiving material to be pulverized, a main shaft, a number of taper rolls, shafts upon which these rolls are mounted, a head connected to the main shaft,

and oscillating j carnal-bearings for the roll- 10 shafts located so close to the main shaft that when the rolls are at rest said rolls will fall away from the Wall of the chamber, substantially as specfied.

VIETTS L. RICE.

Witnesses:

C. R. FERGUSON, WM. M. ILIFF. 

